Air purifier



FIG. 1 is a front perspective view of an air purifier showing my new design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan side view thereof;

FIG. 4 is a right plan view thereof;

FIG. 5 is a left plan side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of the power cord, company logo, bottom surface of the air purifier and air purifier controls is included for the purpose of illustrating use and environment and forms no part of the claimed design. 

We claim the ornamental design for an air purifier, as shown and described. 